Flexible Quantum Dot Color Filter for Higher Blue Light Output
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Solution Overview
Problem
The light output ratio of conventional monochromatic chips with color conversion layer technology in quantum dot displays is very low, limiting their effectiveness in full-color applications.
Innovation Solution
A flexible color filter comprising a polymer resin substrate with receiving grooves for red, green, and blue light, a reflective layer, and a light diffusion layer, along with quantum dot layers, enhances blue light absorption and utilization by refracting and reflecting blue light to increase the light output ratio, utilizing a distributed Bragg reflector and a mixture of organic and inorganic light diffusion materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional monochromatic chip with color conversion layer is used, then the device complexity is reduced, but the light output ratio becomes very low
Solution Approach 1:
The color filter is divided into multiple functional layers: polymer resin substrate layer, reflective layer, light diffusion layer, and quantum dot layer. Each layer performs a specific function to optimize light utilization. The segmentation of functions within the color filter structure enables high light output ratio while maintaining manageable device complexity.
Solution Approach 2:
The patent introduces a vertical stacking dimension with multiple layers (substrate, reflective layer, light diffusion layer, quantum dot layer) to enhance light interaction. This dimensional approach allows blue light to be reflected and diffused multiple times through different layers, increasing absorption efficiency and light output ratio without significantly increasing planar device complexity.
2Manufacturing precision
If the quantum dot layer absorbs more blue light, then the color gamut and purity are improved, but the light diffusion becomes more challenging
Solution Approach 1:
The light diffusion layer acts as an intermediary between the reflective layer and the quantum dot layer. It contains light diffusion particles that scatter blue light in multiple directions, increasing the optical path length and absorption probability without requiring precise control of quantum dot placement. This intermediary layer simplifies manufacturing while achieving high color gamut and purity.
Solution Approach 2:
The patent optimizes parameters such as the concentration of light diffusion particles (5%-20% weight proportion), the thickness of each layer, and the refractive indices of materials to achieve optimal light diffusion and absorption. By adjusting these parameters, high color gamut and purity are achieved without excessive device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly increases the light output ratio and absorption of blue light by quantum dots, ensuring high color gamut and purity for high-quality full-color displays, with blue light absorption exceeding 99% and improved energy utilization.
Implementation Method 1
The blue light in the reflective layer is refracted and reflected back to the quantum dot layer
Implementation Method 2
The blue light in the reflective layer is refracted and reflected back to the quantum dot layer
Implementation Method 3
The quantum dot layer absorbs the blue light and emits fluorescence
Implementation Method 4
The quantum dot layer absorbs the blue light and emits fluorescence
Implementation Method 5
part of the fluorescence emitted to the surroundings is scattered by the light diffusion layer for enhancing the absorption of the blue light
Data Source
AI summary
A flexible color filter, a method of manufacturing thereof, and a full-color micro light-emitting diode device are provided. The full-color micro light-emitting diode device includes a flexible color filter. The flexible color filter includes a polymer resin substrate, a reflective layer, a light diffusion layer, and a quantum dot layer.